Abstract
A facile and efficient synthesis of the carboxyl-linked glucosides of bile acids is described. Direct esterification of unprotected bile acids with 2,3,4,6-tetra-O-benzyl-d-glucopyranose in pyridine in the presence of 2-chloro-1,3,5-trinitrobenzene as a coupling agent afforded a mixture of the α- and β-anomers (ca. 1∶3) of the 1-O-acyl-d-glucoside benzyl ethers of bile acids, which was separated effectively on a C18 reversedphase chromatography column (isolated yields of α- and β-anomers are 4–9% and 12–19%, respectively). Subsequent hydrogenolysis of the α- and β-acyl glucoside benzyl ethers on a 10% Pd−C catalyst in acetic acid/methanol/EtOAc (1∶2∶2, by vol) at 35°C under atmospheric pressure gave the corresponding free esters in good yields (79–89%). Chemical specificities such as facile hydrolysis and transesterification of the acyl glucosides in various solvents were also discussed.
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Abbreviations
- CA:
-
cholic acid
- CDCA:
-
chenodeoxycholic acid
- CTNB:
-
2-chloro-1,3,5-trinitrobenzene
- DCA:
-
deoxycholic acid
- ESI:
-
electrospray ionization
- FT:
-
Fourier transform
- HDCA:
-
hyodeoxycholic acid
- HR-MS:
-
high-resolution mass spectra
- IR:
-
inrrared
- LCA:
-
lithocholic acid
- MDCA:
-
murideoxycholic acid
- NIM:
-
negative ion mode
- NMR:
-
nuclear magnetic resonance
- mp:
-
melting points
- PIM:
-
positive ion mode
- TBGP:
-
2,3,4,6-tetra-O-benzyl-d-glucopyranose
- UDCA:
-
ursodeoxycholic acid
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Iida, T., Nakamori, R., Yabuta, R. et al. Potential bile acid metabolites. 24. An efficient synthesis of carboxyl-linked glucosides and their chemical properties. Lipids 37, 101–110 (2002). https://doi.org/10.1007/s11745-002-0869-3
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DOI: https://doi.org/10.1007/s11745-002-0869-3